Abstract
A nonlinear optical element based on photoanisotropy in azo-dye doped polymers for incoherent image subtraction is presented. Under illumination with polarized light the birefringent properties of the material are changed. Due to specific properties of the process used a quadratic intensity dependence of the resulting image on the intensity difference between the objects occurs. A theoretical approach and experimental verification are presented. Furthermore a practical application of an incoherent two-dimensional image subtraction is given.
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